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A263369 as a simple table

na(n)
15
229
3865
424711
5826249
627274339
7943196037
832850517101
91149496602927
1040220123519645
111407588920518393
1249261304582570101
131724108144663303417
1460343312266592642007
152112014898505756338577
1673920482899832743087347

[5,29,865,24711,826249,27274339,943196037,
 32850517101,1149496602927,40220123519645,
 1407588920518393,49261304582570101,
 1724108144663303417,60343312266592642007,
 2112014898505756338577,73920482899832743087347]